In modern Chinese, the "A+N" structure is also a common phrase combination form. We mainly studied the "A+N" structure noun phrase in query log, including the analysis of syllable A and the classification of the two-syllable A; Then the characteristic of N in this structure is described in detail; Furthermore, we studied the syntactic function in the "A+N" structure, which is reflected in the logs; Finally, the experimental results of this type of phrase are given, and the accuracy reached 93.72%.